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gh-127529: Correct asyncio.selector_events.BaseSelectorEventLoop._accept_connection's behaviour for handling ConnectionAbortedError#127532

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jb2170:gh-127529
Jan 3, 2025
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@jb2170 jb2170 commented Dec 2, 2024 •
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Closes #127529

All good to go. ConnectionAbortedError now continues instead of returning. Improves OpenBSD performance. Full writeup in the issue.

I've left InterruptedError grouped with BlockingIOError to both return early, instead of InterruptedError continueing and BlockingIOError returning. PEP-475 should make InterruptedError never appear right, but hey if it's not broken don't fix it. Best to play it safe with the urgency of signals, especially as asyncio uses them for a wakeup fd.

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@jb2170 jb2170 changed the title gh-127529: Correct asyncio.BaseSelectorEventLoop._accept_connection's behaviour for handling ConnectionAbortedError gh-127529: Correct asyncio.selector_events.BaseSelectorEventLoop._accept_connection's behaviour for handling ConnectionAbortedError Dec 2, 2024
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Fix pythongh-127529: Correct asyncio.selector_events.BaseSelectorEven…
7ab3149 
…tLoop._accept_connection's behaviour for handling ConnectionAbortedError
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jb2170 commented Dec 2, 2024 •
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Force pushes to correct typo / my suckiness at reStructuredText

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jb2170 commented Dec 28, 2024

@1st1 @asvetlov @kumaraditya303 @willingc Trivial PR to review + merge before the new year / before it fades out of memory? 🚀

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kumaraditya303 commented Dec 29, 2024

You need to add tests for this.

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Add BaseSelectorEventLoopTests.test_accept_connection_skip_connection…
317923d 
…abortederror to test graceful handling of ConnectionAbortedError
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jb2170 commented Dec 29, 2024

Hi @kumaraditya303 , thanks for the reply!

I've added a test to test_selector_events.py that checks for the _accept_connection for-loop continuing through aborted connections instead of returning early. The test passes with this PR's changes 😄

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@kumaraditya303 kumaraditya303 enabled auto-merge (squash) January 3, 2025 10:11
@kumaraditya303 kumaraditya303 merged commit 830e106 into python:main Jan 3, 2025
@jb2170 jb2170 deleted the gh-127529 branch January 3, 2025 20:17
WolframAlph pushed a commit to WolframAlph/cpython that referenced this pull request Jan 4, 2025
@jb2170 @kumaraditya303 @WolframAlph
pythongh-127529: Correct asyncio's accept_connection behaviour for …
d123195 
…handling `ConnectionAbortedError` (python#127532)

Co-authored-by: Kumar Aditya <kumaraditya@python.org>
srinivasreddy pushed a commit to srinivasreddy/cpython that referenced this pull request Jan 8, 2025
@jb2170 @kumaraditya303 @srinivasreddy
pythongh-127529: Correct asyncio's accept_connection behaviour for …
55a0f2f 
…handling `ConnectionAbortedError` (python#127532)

Co-authored-by: Kumar Aditya <kumaraditya@python.org>
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ambv commented May 21, 2025 •
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@kumaraditya303 don't we want to backport this to 3.13? WDYT?

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emmatyping commented Dec 14, 2025

@kumaraditya303 I think we still need to backport this, right? Looks like it is blocking the 3.13 backport of #134392

@kumaraditya303 kumaraditya303 added the needs backport to 3.13 bugs and security fixes label Dec 15, 2025
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miss-islington-app bot commented Dec 15, 2025

Thanks @jb2170 for the PR, and @kumaraditya303 for merging it 🌮🎉.. I'm working now to backport this PR to: 3.13.
🐍🍒⛏🤖

miss-islington pushed a commit to miss-islington/cpython that referenced this pull request Dec 15, 2025
@jb2170 @kumaraditya303 @miss-islington
pythongh-127529: Correct asyncio's accept_connection behaviour for …
11f69a7 
…handling `ConnectionAbortedError` (pythonGH-127532)

(cherry picked from commit 830e106)

Co-authored-by: jb2170 <email@jb2170.com>
Co-authored-by: Kumar Aditya <kumaraditya@python.org>
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bedevere-app bot commented Dec 15, 2025

GH-142738 is a backport of this pull request to the 3.13 branch.

@bedevere-app bedevere-app bot removed the needs backport to 3.13 bugs and security fixes label Dec 15, 2025
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kumaraditya303 commented Dec 15, 2025

I think we still need to backport this, right? Looks like it is blocking the 3.13 backport of #134392

Thanks for the reminder, I'll get this and the other one backported.

kumaraditya303 added a commit that referenced this pull request Dec 15, 2025
@miss-islington @jb2170 @kumaraditya303
[3.13] gh-127529: Correct asyncio's accept_connection behaviour for…
18bd88f 
… handling `ConnectionAbortedError` (GH-127532) (#142738)

gh-127529: Correct asyncio's `accept_connection` behaviour for handling `ConnectionAbortedError` (GH-127532)
(cherry picked from commit 830e106)

Co-authored-by: jb2170 <email@jb2170.com>
Co-authored-by: Kumar Aditya <kumaraditya@python.org>
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asyncio's BaseSelectorEventLoop._accept_connection returns when it should continue on ConnectionAbortedError

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